Engine-lathe.



No. 767,609. PATENTED AUG. 16, 1904.

- R. TEEGLER.

ENGINE LATHE.

APPLICATION FILED JULY 16, 1903. no MODEL.

Fig.1.

' UNITED STATES Patented August 16, 1904.

ROBERT TEEGLER, OF HEERDT. NEAR DUSSELDORF, GERMANY.

ENGINE-LATHE.

SPECIFICATION forming part of Letters Patent No. 767,609, dated August 16, 1904.

Application filed July 16,1903. Serial No. 165,792. (No model.)

To all whom it may concern:

Be it known that 1, ROBERT ,TEEGLER, a citizen of Germany, residing at Heerdt, near Dusseldorf, Germany, have invented a new and Improved Lathe, of which the following is a specification.

This invention relates to an improved lathe the frame of which is provided with a mutilated nut that is engaged by a rotatable screw carried by the slide-rest.

The lead-screws generally in use on lathes wear out unequally, as the portion near the head-stock is used more frequently than the other parts. This unequal wearing out of the screw effects an irregular feed of the sliderest and the work-tool. In order to overcome this objection, I provide the frame of the lathe with a mutilated nut that is engaged by a screw carried by the slide-rest in such a manner that it may be brought out of engage ment with the nut during the backward movement of the slide-rest. The nut is composed, preferably, of a suitable number of separate sections, so that the worn-out sections may easily be removed and replaced.

In the accompanying drawings, Figure 1 is a side view, partly broken away, of part of a lathe embodying my invention. Fig. 2 is a cross-section thereof. Fig. 3 is a similar cross-section showing the parts in a different position, and Fig. 4 is a vertical section on line C D, Fig. 8.

To the frame a of the lathe is attached by screws (4 a mutilated nut that is preferably composed of a suitable number of separate sections 7) b 6 as shown in Fig. 1. The nut Z) is engaged by a screw or worm 8, fast on shaft 8, that rotates in bearings of a pivoted frame 0. This frame is adapted to swing on a pin (Z, carried by the slide-rest 7 Upon shaft 8 there is mounted a fast pinion It, that intergears with a pinion g, loosely mounted upon pin. (Z. Pinion g in turn is engaged by a gear-wheel f, movable along a spindle e.

Spindle 0 extends along the frame of the lathe and receives rotary motion in the usual manner. A longitudinal groove 6 of spindle c is engaged by a feather of gear-wheel f, so that the rotation of shaft 0 will impart a corresponding rotation to screw 8 through gearwheels f, g, and it. The swinging frame 0 is provided with a stud 2, carrying roller 2. This roller engages an inclined slot p of an arm 1*, which is rigidly secured to a shaft 9*. The latter is mounted in a suitable bearing 2" of slide-rest v1 and is provided with a handle 7:. By turning handle It the arm 9" will be turned on fulcrum r and will by the engagement of slot 19 with roller 2 tilt the swinging frame 0 around pin (Z, so as to bring screw 8 into or out of engagement with the sections 6 I) b of the mutilated nut. Thus it will be seen that after the tool carried by slide-rest has performed its work the screw 8 may be brought out of engagement with nut b by turning handle it. Afterthis disengagement has been effected the slide-rest may be brought back into its initial position by hand without the use of nut b. In this way the wearing out of nut b is limited to a minimum. Further, as the nut is composed of several sections the worn-out pieces may easily be removed or replaced.

hat I claim is A lathe provided with a mutilated nut, a slide-rest, a frame pivoted to the slide-rest, a screw rotatably supported by the frame and adapted to engage the nut, a stud on the frame, an arm having an inclined slot which is engaged by the stud, a hand-lever connected to the arm, and means for locking the hand-lever, substantially as specified.

Signed by me at-Dtisseldorf, Germany, this 29th day ofJune, 1903.

ROBERT TEEGLER.

Witnesses:

WILLIAM EssENWEIN, PETER LIEBER. 

